Back-illuminated photoelectrochemical flow cell for efficient CO2 reduction

Bin Liu, Tuo Wang, Shujie Wang, Gong Zhang, Dazhong Zhong, Tenghui Yuan, Hao Dong, Bo Wu and Jinlong Gong ()
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Bin Liu: Tianjin University
Tuo Wang: Tianjin University
Shujie Wang: Tianjin University
Gong Zhang: Tianjin University
Dazhong Zhong: Tianjin University
Tenghui Yuan: Tianjin University
Hao Dong: Tianjin University
Bo Wu: Tianjin University
Jinlong Gong: Tianjin University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Photoelectrochemical CO2 reduction reaction flow cells are promising devices to meet the requirements to produce solar fuels at the industrial scale. Photoelectrodes with wide bandgaps do not allow for efficient CO2 reduction at high current densities, while the integration of opaque photoelectrodes with narrow bandgaps in flow cell configurations still remains a challenge. This paper describes the design and fabrication of a back-illuminated Si photoanode promoted PEC flow cell for CO2 reduction reaction. The illumination area and catalytic sites of the Si photoelectrode are decoupled, owing to the effective passivation of defect states that allows for the long minority carrier diffusion length, that surpasses the thickness of the Si substrate. Hence, a solar-to-fuel conversion efficiency of CO of 2.42% and a Faradaic efficiency of 90% using Ag catalysts are achieved. For CO2 to C2+ products, the Faradaic efficiency of 53% and solar-to-fuel of 0.29% are achieved using Cu catalyst in flow cell.

Date: 2022
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DOI: 10.1038/s41467-022-34926-x

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